Prior to this I just went to google and in the search window I typed "define: and my word that I am looking for".
It certainly gives you much more, but certainly not as quick and as clean as this site making it much easier to read and I guess the whole goal of finding what you're looking for quicker.
It's nice, but I use the Dictionary app included in OS X. It's faster than going to a website to define something. Just right-click, look up in dictionary, and bam!